Chemical Engineering > GATE 2017 > Particle Size
Size analysis was carried out on a sample of gravel. The data for mass fraction (xi) and average particle diameter (Dpi) of the fraction is given in the table below:
xi Dpi (mm)
0.2 5
0.4 10
0.4 20
The mass mean diameter of the sample, to the nearest integer, is

Explanation

Correct : 13

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